122 



HORTUS GRAMINEUS WOBURNENSIS. 



rior grasses flourished here in an extraordinary degree : it there- 

 fore offers data whereby to judge of the comparative value of soils 

 for grasses. 



X. Vegetable Mould. 

 400 grains, freed from moisture, gave of 



Fine sand - 231 grains. 



Undecompounded vegetable fibre - 13 



Decomposing vegetable fibre - 57 



Silica - 50 



Alumina - 18 



Soluble matter, principally vegetable extract 4 



Oxide of iron 2 



Loss - 25 



400 



XI. Active Peat, or Fertile Peat Moss. 

 400 grains, freed from moisture, gave of 



Fine siliceous sand - 156 grains. 



Undecompounded vegetable fibre - 2 



Decomposing vegetable matter - 110 



Muriate of lime - 4 



Silica - 102 



Alumina - - 16 



Oxide of iron 4 



Soluble vegetable and saline matter 4 



Loss - - 2 



400 



XII. Inert Peat t or Barren Peat Moss. 

 400 grains, freed from moisture, consisted of 



Fine pure siliceous sand - - 29 grains. 



Inert vegetable matter - - 289 



Alumina - - 14 



Oxide of iron - 30 



Soluble vegetable matter, containing also 



sulphate of potash - 11 



and, sulphate of lime, or gypsum - 12 



Loss - - 15 



400 



